console.log((11.12).toString());
// number 类型自动转换 Number 对象
console.log(Math.floor(4.5));
console.log(Math.ceil(4.5));
console.log(Math.round(4.5));
console.log(Math.max(1, 2, 3, 4, 5, 6));
console.log(Math.min(1, 2, 3, 4, 5, 6));
console.log(Math.random());

let num = Math.random();
console.log(num);
console.log(num.toFixed(2));

console.log(parseInt("12.3")); //globalThis 全局对象方法qwqs
console.log(parseFloat("12.3"));
console.log(parseFloat("12.3px"));
num = Number("12.3px");
console.log(num);
console.log(num === NaN);
console.log(isNaN(num));
